10 



SYNCHRONOUS MOTORS 



* 3 = /o sin (<y/ 2-^-j; 

 * 4 = /o sin \a)t- 3yj; 



= sn ajt- 





 * 6 =/ sin U>/-5; 



in which 



277 

 tO = -=:. 



AXLS of 



FIG. 7. 



T being the common duration of the period of the alternating currents 

 considered, IQ their common amplitude (i.e., maximum value), and 

 i\, *2> *':*, *4, is, i&, being the currents in the slots i, 2, 3, 4, 5, 6. 



It will be seen that, at every one-sixth of a period, the currents in 

 the stator resume the same values, but the latter are displaced one- 

 sixth of the width of a double field (2 poles) in the direction in which 

 the currents succeed each other along the stator. Therefore, the axes 

 radiating from the magnetic fields produced by the windings of the 

 stator displace themselves around this stator with an angular velocity; 



60 



it-responding to a number of turns = ~; per minute. 



